>Claiming that someone attains Arhat (or Arahant, if you are used to Theravada texts) with just a couple of meditation retreats is just wild. Because the 9 dhyana, or 9 samadhi, or 9 Juana corresponded to the level of wisdom of an Arhat. It corresponds to enlightenment in Theravada, and in Mahayana too - just not the "biggest" one.
To be fair, the Pali Canon is filled with episodes of followers spontaneously achieving arahantship after practicing only a brief time. I'm having trouble finding the sutta, but even the Buddha says with a single moment of appropriate practice, enlightenment is obtainable immediately.
